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  1. No Access

    Article

    Exact numerical methods for electron-phonon problems

    In the last few years solid state physics has increasingly benefited from scientific computing and the significance of numerical techniques is likely to keep on growing quickly in this field. Because of the hi...

    E. Jeckelmann, H. Fehske in La Rivista del Nuovo Cimento (2007)

  2. No Access

    Article

    Optical conductivity of the one-dimensional dimerized Hubbard model at quarter filling

    We investigate the optical conductivity in the Mott insulating phase of the one-dimensional extended Hubbard model with alternating hop** terms (dimerization) at quarter band filling. Optical spectra are ca...

    H. Benthien, E. Jeckelmann in The European Physical Journal B - Condense… (2005)

  3. No Access

    Article

    Fourth-order perturbation theory for the half-filled Hubbard model in infinite dimensions

    We calculate the zero-temperature self-energy to fourth-order perturbation theory in the Hubbard interaction U for the half-filled Hubbard model in infinite dimensions. For the Bethe lattice with bare bandwidth W

    F. Gebhard, E. Jeckelmann, S. Mahlert… in The European Physical Journal B - Condense… (2003)

  4. No Access

    Chapter and Conference Paper

    On the Semiconductor-Metal Transition in Conducting Polymers

    A simple one-dimensional π-electron Hamiltonian is considered to study the evolution of the ground state of conducting polymers as a function of do**. It is pointed out that the semiconducting and ”metallic”...

    D. Baeriswyl, E. Jeckelmann in Electronic Properties of Polymers (1992)